It appears the students, both 19, were crushed by falling coal which also toppled onto vehicles in a parking lot below the bridge,
CBS Washington affiliate WNEW reports.

The two girls posted photos and comments from what appeared to be the bridge shortly before the train derailed around midnight Monday,
according to Twitter feeds with the same names as the victims.

"Looking down on old ec," wrote Rose Louese Mayr,
who posted an image of downtown Ellicott City.

Profile pictures from the Twitter accounts of Elizabeth Nass,
left, and Rose Mayr.
Both girls, 19, apparently tweeted about hanging out on a bridge before a coal train derailed.

Mayr was a student at the University of Delaware.
She was killed along with her friend,
Elizabeth Conway Nass,
Howard County police spokeswoman Sherry Llewellyn said.
Nass attended James Madison University in Virginia.

"Drinking on top of the Ellicott City sign with @r0se-petals,"
wrote Nass, using her friend's Twitter name.